The only special tools it takes to remove the crank pins are a coupla 2x4s. Put the crank in the "6-oclock" position, with the nut side of the cotter facing up. Put a 2x4, with a notch cut out for the "head" side of the cotter, under the crank; it should be just long enough to reach the floor, and contact/support the arm on either side of the cotter. Unthread the nut so it's flush with the end of the cotter. Put a small piece of 2x4 on top of the nut, and whack it with a hammer. The nut gives you more surface area to take the energy of the hammer-whacks. Once it comes loose, unthread the nut the rest of the way. There's some chance you'll damage the cotters beyond reuse, so have new ones on hand.

Once you get the arms off, maybe all it needs inside is a new set of ball bearings and some fresh grease. Otherwise, if your intention is to maintain a close-to-original look, you may have to find a donor bike with a less-worn cottered crank.